2 This is a demo implementation of a Linux command line tool to access
3 the U-Boot's environment variables.
5 For the run-time utiltity configuration uncomment the line
6 #define CONFIG_FILE "/etc/fw_env.config"
9 See comments in the fw_env.config file for definitions for the
12 Configuration can also be done via #defines in the fw_env.h file. The
13 following lines are relevant:
15 #define HAVE_REDUND /* For systems with 2 env sectors */
16 #define DEVICE1_NAME "/dev/mtd1"
17 #define DEVICE2_NAME "/dev/mtd2"
18 #define DEVICE1_OFFSET 0x0000
19 #define ENV1_SIZE 0x4000
20 #define DEVICE1_ESIZE 0x4000
21 #define DEVICE2_OFFSET 0x0000
22 #define ENV2_SIZE 0x4000
23 #define DEVICE2_ESIZE 0x4000
25 Current configuration matches the environment layout of the TRAB
28 Un-define HAVE_REDUND, if you want to use the utlities on a system
29 that does not have support for redundant environment enabled.
30 If HAVE_REDUND is undefined, DEVICE2_NAME is ignored,
31 as is ENV2_SIZE and DEVICE2_ESIZE.
33 The DEVICEx_NAME constants define which MTD character devices are to
34 be used to access the environment.
36 The DEVICEx_OFFSET constants define the environment offset within the
39 ENVx_SIZE defines the size in bytes taken by the environment, which
40 may be less then flash sector size, if the environment takes less
43 DEVICEx_ESIZE defines the size of the first sector in the flash
44 partition where the environment resides.